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1 Physical Science Worksheets with Answer Keys To jump to a location in this book 1. Click a bookmark on the left. To print a part of the book 1. Click the Print button. 2. When the Print window opens, type in a range of pages to print. The page numbers are displayed in the bar at the bottom of the document. In the example below, 1 of 151 means that the current page is page 1 in a file of 151 pages.

2 Section: The Nature of Science 1. Name four branches of biological science. 2. Define the following terms: a. science b. technology c. scientific model 3. Describe the difference between a scientific law and a scientific theory. 4. Explain why it is important for scientists to be objective in their observations. 5. Explain why each of the following steps is important to scientific study. a. planning experiments b. testing results Holt Science Spectrum 1 Introduction to Science

3 Section: The Way Science Works 1. Name three tools used by scientists, and describe how they are used. 2. Explain why an experiment should test only one variable at a time. 3. Convert the following measurements as indicated: a. 95 cm to meters b. 1.1 L to milliliters c m to kilometers d. 500 kg to grams e mmol to moles 4. Explain why it is important that a hypothesis be stated so that it can be modified. 5. Describe why prefixes are useful with SI units. 6. Explain why scientists use SI units instead of units such as inches and gallons. Holt Science Spectrum 2 Introduction to Science

4 Section: Organizing Data 1. Convert the following measurements from scientific notation to long form: a cm b km c L d g 2. Convert the following measurements to scientific notation: a. 325 kg b m c km d L 3. Find the number of significant digits in each of the following: a b c d Identify the type of graph best suited to display the following: a. the amount of iron ore in four different countries b. the major gases found in Earth s atmosphere c. the price of crude oil since Explain how results can be precise but not accurate. Holt Science Spectrum 3 Introduction to Science

6 Section: Properties of Matter 1. Classify each of the following as a physical or chemical property of sulfur. a. Its density is 2.97 g/cm 3. b. It reacts with hydrogen to form a gas. c. It is a yellow solid. d. Its melting point is 112 C. e. It combines with oxygen. 2. Classify each of the following as a physical or chemical property of phosphorus. a. It is a white, waxy solid. b. It burns in air. c. Its melting point is 44.1 C. d. It has a density of 1.82 g/cm 3. e. Its boiling point is C. 3. Explain how aluminum is a suitable material to use in making cans based on its physical and chemical properties. 4. Calculate the mass of a sample of pure silver (density g/cm 3 ) that has a volume of cm Compute the density of an 820 g sample of pure silicon occupying a 350 cm 3 container. 6. Describe how the characteristic properties of a piece of ice are different from its other properties. Holt Science Spectrum 2 Matter

8 Section: Matter and Energy 1. Identify each of the following as a gas, liquid, solid, or plasma. a. The particles are closely packed together, but they can still slide past each other. b. The particles are in a constant state of motion and rarely stick together. c. The particles are locked in fixed positions. d. The particles are broken apart. 2. Select the answer that best completes each statement describing the energy transfers taking place as water changes state from solid to liquid, from liquid to gas, and from gas back to liquid. a. Energy must be added/released (choose one) to separate the water molecules as ice melts. b. The fastest/slowest (choose one) moving molecules break away from the surface of liquid water to form water vapor. c. The process described in (b) is called _. d. During the above process, energy is released/absorbed (choose one). e. Water molecules speed up/slow down (choose one) as water vapor returns to the liquid water state. f. The process described in (e) is called _. g. Energy is released/absorbed (choose one) during the above process. 3. Apply the kinetic theory to describe the motion of particles in a homogeneous mixture of sugar and water as it is boiled. 4. Explain how mass and energy are conserved when water evaporates. Holt Science Spectrum 1 States of Matter

9 Section: Fluids 1. Explain how Archimedes principle determines the buoyant force on an object in any fluid medium. 2. Compare the buoyant force of water and the weight of a piece of wood that floats on the water. 3. Calculate the pressure of an enclosed fluid on which a force of 150 N is exerted over an area of 10 cm 2. Give the answer in pascals. 4. Explain Pascal s principle. 5. Calculate the force output by the larger piston of a hydraulic lift when a force of 700 N is exerted on the smaller piston. The areas of the two pistons are 20 cm 2 and 950 cm Define Bernoulli s principle. Holt Science Spectrum 2 States of Matter

10 Section: Behavior of Gases 1. Identify which gas law is being demonstrated. a. increase in volume, decrease in pressure b. decrease in temperature, decrease in volume c. increase in pressure, increase in temperature 2. Compare and contrast the physical properties of solids, liquids, and gases. 3. Boyle s law relates the pressure of a gas to the of a gas. a. volume c. density b. pressure d. temperature 4. Charles law relates the volume of a gas to the of a gas. a. mass c. temperature b. density d. molecules 5. Gay-Lussac s law relates the temperature of a gas to its a. mass. c. density. b. volume. d. pressure. 6. Explain what must happen to a fixed sample of gas when its temperature changes. Holt Science Spectrum 3 States of Matter

11 Section: Atomic Structure 1. Draw and label the parts of a helium atom. Include the mass and charge of each subatomic particle. 2. Describe the three main ideas of Dalton s atomic theory in your own words. 3. Compare the outermost electrons of an atom with the inner electrons of an atom in terms of energy. 4. Compare the positions of the electrons in Bohr s model of the atom with their positions according to modern atomic theory. Holt Science Spectrum 1 Atoms and the Periodic Table

12 Section: A Guided Tour of the Periodic Table 1. Write the chemical symbol for each of the following elements: a. manganese b. lead d. uranium e. radon c. carbon f. silver 2. State the importance of valence electrons in the organization of the periodic table. 3. Describe the difference between the atomic number and the mass number of an atom. 4. Understanding Systems Why do atoms of Group 1 elements lose electrons to form cations, whereas atoms of Group 17 elements gain electrons to form anions? 5. Create a chart that shows the different isotopes of hydrogen. State the name of each isotope, and write the number of protons, neutrons, and electrons found in each isotope. 6. Explain how the relative abundance of each hydrogen isotope affects hydrogen s average atomic mass. Holt Science Spectrum 2 Atoms and the Periodic Table

13 Section: Families of Elements 1. Classify each of the following elements as an alkali metal, alkaline-earth metal, transition metal, or semiconductor based on its position in the periodic table. a. rubidium, Rb b. silicon, Si c. silver, Ag d. barium, Ba 2. Classify each of the following elements as a halogen, noble gas, or other nonmetal based on its position in the periodic table. a. carbon, C b. chlorine, Cl c. radon, Rn d. phosphorus, P 3. Predict which of the following ions would be likely to form: a. Na 2 b. Cl d. Br e. Ne c. Ca 2 f. Ne 4. Explain why chlorine, Cl, is very reactive, whereas argon, Ar, is unreactive. 5. Analyze the following pairs of elements, and determine whether each pair has similar or different reactivities. a. potassium, K, and rubidium, Rb b. calcium, Ca, and barium, Ba c. sodium, Na, and chlorine, Cl d. helium, He, and krypton, Kr Holt Science Spectrum 3 Atoms and the Periodic Table

14 Section: Using Moles to Count Atoms 1. Define a mole. 2. Identify which of the following statements are correct: a. 1 mol of titanium, c. 2 mol of carbon, C, Ti, is g are g b. 1 mol of strontium, d. 1 mol of mercury, Hg, Sr, is g is g 3. Explain why the mole is used as a counting unit for atoms. 4. Determine the molar mass of each of the following elements: a. calcium, Ca c. sulfur, S b. cobalt, Co d. oxygen, O 5. Outline the steps required to find the mass in grams of an element from a given amount of the element in moles. 6. Determine the mass in grams of each of the following: a mol of neon, Ne c. 1.9 mol of selenium, Se b mol of xenon, Xe d. 3.3 mol of gold, Au 7. Determine the amount in moles of each of the following: a g of hydrogen, H c. 26 g of chromium, Cr b. 405 g of boron, B d. 8.5 g of sulfur, S Holt Science Spectrum 4 Atoms and the Periodic Table

15 Section: Compounds and Molecules 1. Explain why it is more difficult to separate the elements of a compound than the substances in a mixture. 2. Write the numbers and kinds of atoms or ions contained in the following compounds: a. NaCl b. CO 2 c. KBr d. NH 3 e. MgO 3. Describe the difference between a ball-and-stick model and a space-filling model of a compound. 4. Explain why a substance with a network structure has a high melting point. 5. Contrast the structure of table salt and table sugar. 6. Predict whether a compound with a boiling point of 68 C is likely to be a network solid or in the form of individual molecules. Holt Science Spectrum 1 The Structure of Matter

16 Section: Ionic and Covalent Bonding 1. Explain why atoms will often join together to form bonds. 2. Explain why table salt does not melt easily. 3. Contrast ionic and covalent bonds. 4. Explain why a triple bond between two nitrogen atoms is stronger than a double bond between two oxygen atoms. 5. Explain how it is possible for a compound to have both ionic and covalent bonds. 6. Predict whether a gold ring would be a good conductor of electricity. What kind of bonds does gold have? How do these bonds explain gold s properties? Holt Science Spectrum 2 The Structure of Matter

18 Section: Organic and Biochemical Compounds 1. Identify the following compounds as alkanes, alkenes, or alcohols based on their names. a. 1-propanol b. cyclopentene c. cyclopentanol d. methylcyclopropane e. 2-butene f. 2-ethylhexane 2. Contrast alkanes and alkenes, and give an example of each. 3. Explain the similarities between alcohol molecules and water molecules. 4. Explain how glucose and starch are related. 5. Explain why carbon can never form more than a total of four bonds. 6. Explain how the bases that form DNA make pairs. Holt Science Spectrum 4 The Structure of Matter

19 Section: The Nature of Chemical Reactions 1. Identify the reactants and products in each of the following chemical reactions. a. Fe 2 O 3 2Al : 2Fe Al 2 O 3 b. 2AgNO 3 H 2 SO 4 : Ag 2 SO 4 2HNO 3 2. Explain where the energy to cook food comes from when a gas stove burns natural gas, CH 4, and oxygen, O Describe three signs that a chemical reaction has taken place, and give an example of each sign. 4. Identify the elements present in the original compound using the following statement of a chemical reaction. A white solid is heated and gives off carbon dioxide, CO 2, and water, H 2 O, leaving behind sodium carbonate, Na 2 CO Contrast endothermic and exothermic reactions. 6. Predict the products of the decomposition reactions of the following substances: a. mercury oxide, HgO b. silver oxide, Ag 2 O Holt Science Spectrum 1 Chemical Reactions

22 Section: Rates of Change 1. State Le Châtelier s principle. 2. Describe two ways you could make table salt dissolve faster in water. 3. Predict the shift of equilibrium for each of the following conditions in the following reaction involving gaseous reactants and products: N 2 3H 2 N 2NH 3 heat. a. NH 3 is added to the reaction. b. NH 3 is removed from the reaction. c. The pressure is increased. d. The temperature is decreased. 4. Predict how each of the following changes will affect the following reaction involving gaseous reactants and products: 2NO 2 N N 2 O 4 heat. a. raising the temperature b. increasing the pressure c. removing N 2 O 4 from the equilibrium mixture d. adding NO 2 to the equilibrium mixture Holt Science Spectrum 4 Chemical Reactions

23 Section: Solutions and Other Mixtures 1. Classify each of the following mixtures as homogeneous or heterogeneous: a. lemonade with pulp b. coffee with cream and sugar c. vinegar d. dessert gelatin with pears in it 2. Compare suspensions, colloids, and solutions in terms of particle size and methods to separate each type of mixture. 3. Explain why the air we breathe and solids such as steel and bronze, are solutions or homogeneous mixtures, just like salt water is. 4. Identify the solute and solvent when sugar and water are mixed to form nectar for a hummingbird feeder. 5. After boiling a chicken in a stock pot, you let the chicken stock cool down and place it in the refrigerator overnight. The next day you notice that a solid layer of fat has formed on the top of a gelatinous mixture. a. Explain why the chicken fat rose to the top. b. Describe how you could separate the fat from the gelatinous mixture. c. Give examples of two liquid solutions that do not contain water. Holt Science Spectrum 1 Solutions

24 Section: How Substances Dissolve 1. Explain how you can speed up the dissolving process when preparing juice from frozen concentrate. 2. Explain why water is sometimes referred to as the universal solvent. 3. Draw a water molecule. Indicate the area where the electrons would be found. Label each atom and include all charges. 4. You make a salad dressing by mixing water, vinegar, olive oil, and seasonings. After a while, the oil separates and forms a layer above the other components. a. Identify the polar and nonpolar liquids in the dressing. b. Compare the strength of the attractions between a water molecule and a molecule of vinegar and between a water molecule and a molecule of olive oil. 5. Describe what happens when sodium chloride dissolves in water. Holt Science Spectrum 2 Solutions

25 Section: Solubility and Concentration 1. Summarize how to produce three solutions of sugar in water: an unsaturated solution, a saturated solution, and a supersaturated solution. 2. Describe what happens to a saturated solution of sugar in water when the temperature of the solution is suddenly lowered by 10ºC. 3. Determine how many grams of acetic acid should be dissolved in 100 g of water to make a 4.0 percent (by mass) solution of vinegar. 4. Calculate the molarity of a solution that contains 93.5 g of potassium chloride, KCl, dissolved in ml of solution. 5. Order the following ionic compounds according to their solubility in water, from most soluble to least soluble. Refer to Table 1, Solubilities of Some Ionic Compounds in Water, in your textbook. calcium chloride, sodium fluoride, silver nitrate, iron(ii) sulfide, sodium iodide 6. When divers ascend too quickly, nitrogen dissolved in the blood comes out of solution, forming bubbles in the blood vessels. Treatment for this condition, known as the bends, involves placing the diver in a chamber where the pressure is higher than that of atmospheric pressure. Explain how increasing the pressure can help treat the bends. Holt Science Spectrum 3 Solutions

26 Section: Acids and Bases 1. Classify each of the following substances as acidic, basic, or neutral: a. a dilute solution of vinegar in water, which has more H 3 O ions than OH ions b. a solution with equal concentrations of H 3 O and OH c. a bitter liquid, ph 8 d. pure water, ph 7 e. a tart solution of mixed citrus juices, ph 7 2. Compare two kinds of bases, and give an example of each type. 3. Compare the acidity of three solutions having ph values of 2, 3, and Write the balanced chemical equation that describes the dissociation of the strong base magnesium hydroxide, Mg(OH) 2, in water. 5. Determine the hydronium ion concentration (M) of an acid solution with a ph of Calculate the ph of a M solution of the strong acid, HCl. 7. Explain why sulfuric acid conducts electricity better than citric acid. Holt Science Spectrum 1 Acids, Bases, and Salts

27 Section: Reactions of Acids with Bases 1. Write the balanced ionic equation for the reaction between water solutions of nitric acid, HNO 3, and sodium hydroxide, NaOH. Circle the spectator ions. 2. Predict whether the neutralization reaction of each of the following acids and bases will yield an acidic, basic, or neutral solution: a. hydrochloric acid, HCl, and calcium hydroxide, Ca(OH) 2 b. citric acid, H 3 C 6 H 5 O 7, and sodium hydroxide, NaOH c. nitric acid, HNO 3, and methylamine, CH 3 NH 2 3. Identify the acid and base combined to produce the following salts: a. potassium nitrate, KNO 3 b. calcium chloride, CaCl 2 c. barium sulfate, BaSO 4 4. Describe what happens at the molecular level when the equivalence point is reached during the titration of sulfuric acid, H 2 SO 4, and potassium hydroxide, KOH. 5. Name two common salts and give a use for each. 6. Predict the ph of the solution obtained when a 1.0 M magnesium hydroxide solution, Mg(OH) 2, is titrated with an equal amount of a 1.0 M solution of sodium chloride, NaCl. Holt Science Spectrum 2 Acids, Bases, and Salts

28 Section: Acids, Bases, and Salts in the Home 1. Classify the following household products as either acids or bases: a. soap e. clothing dyes b. bleach f. antacid c. vitamin C g. vinegar d. baking soda h. lye 2. Describe the role of soap as an emulsifier when washing oil or grease from your hands. 3. Explain why a substance containing only long hydrocarbon chains would not be a good emulsifier for mixtures of water and oil. 4. Hydrogen peroxide, H 2 O 2, is a common bleaching agent and disinfectant readily available at the local drugstore as a 3 percent solution. a. Describe what a disinfectant does. b. Describe what a bleaching agent does. 5. Summarize what happens in your stomach when you take an antacid for indigestion. Holt Science Spectrum 3 Acids, Bases, and Salts

29 Section: What Is Radioactivity? 1. Write in the blank the term that matches each description. beta particles alpha particles neutron emission gamma rays a. helium-4 nuclei b. high-energy electromagnetic radiation emitted by a nucleus c. electrons emitted by neutrons decaying into an unstable nucleus d. release of high-energy neutrons 2. Determine the amount of time it takes for three-fourths of a radioactive sample of an isotope of bromine to decay. The half-life of the isotope is 16.5 hours. 3. Complete the following radioactive decay equations by identifying the isotope X. Indicate whether alpha or beta decay occurs. a. b Pb : A 0 ZX 1 e Bi : A 0 ZX 1 e 214 c. 84 Po : Z A X 4 2 He 4. Explain how it is possible that negatively charged beta particles are emitted from a positively charged nucleus during nuclear decay. 5. Determine the half-life of a radioactive substance that has changed through radioactive decay. After 40 days, the original substance left is one-sixteenth of the original amount. 6. Identify which of the following is true for gamma ray emission. a. The atomic number increases but the atomic mass stays the same. b. Both the atomic number and the atomic mass remain the same. c. The atomic number decreases and the atomic mass increases. d. The atomic number stays the same and the atomic mass decreases. Holt Science Spectrum 1 Nuclear Changes

30 Section: Nuclear Fission and Fusion 1. Write in the blank the term that matches each definition. critical mass fusion reaction strong nuclear force a. attractive force that acts between nucleons at very short distances b. joining of two lighter nuclei to form a heavier nuclei c. the minimum mass of a fissionable isotope in which a nuclear chain reaction can occur 2. Describe how a fission reaction is started. 3. Describe a characteristic of a fissionable substance that is essential for a chain-reaction to sustain itself. 4. Explain why the energy associated with even a small mass is immense. (Hint: Consider the way c appears in the mass-energy equation.) 5. Describe how the strong nuclear force affects the composition of a nucleus. Holt Science Spectrum 2 Nuclear Changes

31 Section: Nuclear Radiation Today 1. People receive some natural or background radiation exposure each day from a. the sun. b. household appliances such as television sets and microwave ovens. c. medical and dental X rays. d. All of the above 2. Determine whether the following statements are true or false. a. The longer a person is exposed to radiation and the closer the person is to the radiation, the greater the risk. b. Radiation cannot be detected by our sense of sight, smell, taste, hearing, or touch. c. Alpha particles gain energy as they ionize matter. 3. Explain why ventilation is very important if there is a risk of exposure to radon gas in your home or school. 4. Name the nuclear radiation(s) that can be easily stopped by skin or clothes. 5. Explain ionization. Which forms of nuclear radiation are capable of ionizing matter? 6. Explain one method of how nuclear radiation is used in the field of medicine. Holt Science Spectrum 3 Nuclear Changes

32 Section: Measuring Motion 1. Select the quantity that has changed velocity or speed for a car that travels north at 88 km/h and then turns east while continuing to move at 88 km/h. Explain your answer. 2. Infer how distance and speed in the motions of clock parts are used to measure time. 3. Explain how you can use the speedometer and a clock to tell how far you ve traveled in a car if the car s odometer is not working. (Hint: Assume you are traveling at a constant velocity.) 4. Calculate the distance a plane flies on a 7.95-hour flight from Chicago to London. Assume a constant speed of km/h. 5. Determine a skier s velocity in km/h, if it takes her 1.7 min to ski down a 1.67 km slope. 6. Describe how you could use two photographs taken at different times to prove that the moon is in motion. Holt Science Spectrum 1 Motion

33 Section: Acceleration 1. Calculate the average acceleration of a car that changes speed from 0 m/s to 15 m/s in 5 s. 2. Explain why you are always accelerating when you ride a merry-go-round, even though the speed of the merry-go-round does not change. 3. a. Graph the data from the table below onto a speed-time graph. Label both axes. Plot all the data points and draw a straight line connecting them. CAR SPEED Time (s) Speed (m/s) b. Determine the car s acceleration. 4. Calculate how long it takes for a stone falling from a bridge with an average acceleration downward of 9.8 m/s 2 to hit the water. The stone starts from rest and hits the water with a velocity of 12.3 m/s. 5. Identify the straight-line accelerations below as either speeding up or slowing down. a m/s 2 b m/s 2 c. 3.9 m/s 2 Holt Science Spectrum 2 Motion

34 Section: Motion and Force 1. Suggest why placing wheels under a heavy box reduces the necessary force required to push it along at a constant speed. 2. Analyze the following situations, and indicate whether the forces are balanced or unbalanced. a. a skydiver accelerating downward b. a cannonball fired parallel to the ground c. a motorboat coasting at a constant speed d. a bike leaning against a tree 3. Evaluate the change of motion in the following cases in which the forces on an object change from balanced to unbalanced. a. The brake of a car parked on a hill is released. b. A skydiver falling at a constant speed opens her parachute. 4. Give an example of harmful friction and describe how it can be reduced. 5. Identify the following examples of friction as harmful or helpful. a. friction between your hands as you rub them together for warmth b. friction between bones in a joint c. friction between a dentist s drill and your tooth d. friction between a saw blade and a piece of lumber Holt Science Spectrum 3 Motion

35 Section: Laws of Motion 1. Interpret the following situations to determine whether an object s velocity is being altered by an applied force (answer Yes or No). a. a batter hits a baseball upward into right field b. a satellite orbits Earth at a constant speed of 7000 m/s c. a submarine moves due east at a constant speed of 45 m/s d. a falling book lands on the floor with a precollision speed of 9 m/s 2. Calculate the acceleration of a 82 kg couch that is pushed across the floor with an unbalanced force of 21 N. 3. Apply Newton s first and second laws to explain why an object moving in a circular path at a constant speed is undergoing acceleration and has a force exerted on it. 4. Determine the force needed to accelerate a 1357 kg car forward at 8.0 m/s Explain why a backward-facing car seat is safer for an infant than a seat that faces forward during a collision or abrupt stop. 6. Use the concept of inertia to illustrate why volleyball is not played with a ball that has a mass similar to a bowling ball. Holt Science Spectrum 1 Forces

36 Section: Gravity 1. Explain why free-fall acceleration can be regarded as a constant for objects falling within a few hundred miles of Earth s surface. 2. Identify which pair of objects would have greater gravitational force between them in the examples below. Use the law of universal gravitation to explain your answers. A B 3. Predict the path of the cannon ball below. To do this, draw a line in the direction of the cannon ball s flight. Also draw and label the horizontal and vertical components of the cannon ball s projectile motion. 4. Calculate the mass in kg of an object that weighs 1225 N on Earth. Holt Science Spectrum 2 Forces

37 Section: Motion and Force 1. Suggest why placing wheels under a heavy box reduces the necessary force required to push it along at a constant speed. 2. Analyze the following situations, and indicate whether the forces are balanced or unbalanced. a. a skydiver accelerating downward b. a cannonball fired parallel to the ground c. a motorboat coasting at a constant speed d. a bike leaning against a tree 3. Evaluate the change of motion in the following cases in which the forces on an object change from balanced to unbalanced. a. The brake of a car parked on a hill is released. b. A skydiver falling at a constant speed opens her parachute. 4. Give an example of harmful friction and describe how it can be reduced. 5. Identify the following examples of friction as harmful or helpful. a. friction between your hands as you rub them together for warmth b. friction between bones in a joint c. friction between a dentist s drill and your tooth d. friction between a saw blade and a piece of lumber Holt Science Spectrum 3 Motion

38 Section: Work, Power, and Machines 1. Define each of the following terms, and write the equation for each. a. work b. power c. mechanical advantage 2. Explain the relationship between work and power. 3. Explain how machines make work easier if they still require that the same amount of work be done. 4. Calculate the amount of work done when a grocery store stocker uses 120 N of force to lift a sack of flour 1.5 m onto a shelf. 5. Calculate the average power in kilowatts required to pull a car up a ramp if the amount of work is 250 kj over a period of 45 s. 6. Calculate the mechanical advantage of a group of pulleys used to raise an engine from a car. The engine is raised 1.2 m with the pulleys when 4.8 m of rope is pulled through the pulleys. Holt Science Spectrum 1 Work and Energy

39 Section: Simple Machines 1. Name an example of each of the following types of simple machines: a. lever b. wedge c. pulley d. wheel and axle e. inclined plane f. screw 2. Draw the three types of levers, and label the input force, output force, and fulcrum on each. First-class lever Second-class lever Third-class lever 3. Compare a wedge and a screw with an inclined plane. 4. Describe how an inclined plane increases the force without changing the amount of work done. 5. Explain how a wheelbarrow is a compound machine. Holt Science Spectrum 2 Work and Energy

40 Section: What Is Energy? 1. Define the following terms: a. kinetic energy b. potential energy c. mechanical energy 2. Calculate the gravitational potential energy of a 95 kg rock at the top of a 45 m cliff. The acceleration due to gravity is 9.8 m/s2. 3. Calculate the kinetic energy of a bicyclist traveling at 11 m/s. The total mass of the cyclist and the bike is 74 kg. 4. Identify the type of energy stored in a stretched bungee cord. 5. Explain how sunlight is converted into potential energy by plants. 6. Explain how the kinetic energy of an object changes when the speed of the object doubles. 7. Contrast chemical energy and mechanical energy. Holt Science Spectrum 3 Work and Energy

41 Section: Conservation of Energy 1. Define the term efficiency. 2. List two ways mechanical energy can be transformed to nonmechanical energy. 3. Calculate the efficiency of the following machines: a. A lever is used to lift a 45 N rock. The applied force is 75 N. b. A pulley system raises a 39 N log with an applied force of 45 N. c. You do 425 J of work to push a 75 N box up a ramp until the box is 2.5 m above the ground. 4. Describe why a high-efficiency machine is more desirable than a low-efficiency machine. 5. Explain why the height of a bouncing ball decreases after each bounce. 6. Explain how a skier gliding down a hill illustrates the conservation of energy. Holt Science Spectrum 4 Work and Energy

42 Section: Temperature 1. Define temperature in terms of kinetic energy. 2. Explain the difference between total and average molecular kinetic energy of a gas contained in a box. 3. Explain how a liquid thermometer measures temperature. 4. Convert the following temperatures as indicated. a. What is 16 C on the Farenheit scale? b. What is 95 F on the Celsius scale? c. What is 30 C on the Kelvin scale? d. What is 100 K on the Celsius scale? 5. Predict what will happen if a block of hot iron is placed in a glass of cool water. 6. Evaluate the following newspaper headline. Is it realistic? Explain. Scientists Create a Thermometer to Measure Temperatures Below 0 Kelvin 7. Explain why a metal door should not be built to fit tightly to the frame of a door, especially in a region where the weather gets hot. Holt Science Spectrum 1 Heat and Temperature

43 Section: Energy Transfer 1. Explain why a ceramic bowl will keep oatmeal hot longer than a stainless steel bowl. 2. Explain which method of heat transfer can take place if two objects at different temperatures are placed without touching each other in a vaccum. 3. Calculate how much energy must be transferred as heat in each of the following situations. Use the following equation: energy (specific heat) mass (temperature change) a. A 100 kg tank of water is warmed from 10 C to 25 C; specific heat 4180 J/kg K b. 100 kg of steam is raised from 120 C to 135 C; specific heat 1870 J/kg K 4. Explain why steam (gas) has a lower specific heat than water (liquid). 5. Describe the method of heat transfer involved when you mix hot water with cold water to make lukewarm water. 6. Determine which is the best type of skillet. Some people prefer a heavy cast iron skillet while others prefer a thin stainless steel one. (Hint: Think about how each skillet conducts heat.) Holt Science Spectrum 2 Heat and Temperature

44 Section: Energy Transfer 1. Explain why a ceramic bowl will keep oatmeal hot longer than a stainless steel bowl. 2. Explain which method of heat transfer can take place if two objects at different temperatures are placed without touching each other in a vaccum. 3. Calculate how much energy must be transferred as heat in each of the following situations. Use the following equation: energy (specific heat) mass (temperature change) a. A 100 kg tank of water is warmed from 10 C to 25 C; specific heat 4180 J/kg K b. 100 kg of steam is raised from 120 C to 135 C; specific heat 1870 J/kg K 4. Explain why steam (gas) has a lower specific heat than water (liquid). 5. Describe the method of heat transfer involved when you mix hot water with cold water to make lukewarm water. 6. Determine which is the best type of skillet. Some people prefer a heavy cast iron skillet while others prefer a thin stainless steel one. (Hint: Think about how each skillet conducts heat.) Holt Science Spectrum 2 Heat and Temperature

45 Section: Using Heat 1. Explain why placing a damp towel over a fan will increase its ability to cool a room. 2. Apply what you have learned about heating and cooling systems to the following situations, and determine whether the following are true. Explain your reasoning. a. Opening the door of the refrigerator will cool the kitchen. b. Shivering when you are cold actually warms you up. c. Desert jackrabbits have large ears to keep them cool. 3. Describe a method of insulation that can completely eliminate heat loss by conduction. 4. Explain how a diesel engine is different from other internal combustion engines. Holt Science Spectrum 3 Heat and Temperature

46 Section: Types of Waves 1. Give three examples of mechanical waves, and identify the medium through which they travel. 2. a. Name the one type of wave that does not require a medium. b. State what oscillates in this type of wave. 3. Describe the motion of the particles in the medium for each type of wave. How does this motion compare to the direction the wave travels? a. transverse wave b. longitudinal wave 4. Explain what happens to the motion of a particle as a wave passes through a medium. How is the motion of the particle like the motion of a mass on a spring? 5. Use the figure below to answer the following questions. The figure shows a pattern of wave fronts that are formed when a pebble is dropped into a pool of water. a. Compare the height of the wave fronts in circles A, B, and C. b. Indicate the wave front in which the energy of the wave is most spread out. A B C c. Compare the amount of total energy in each of the wave fronts. Holt Science Spectrum 1 Waves

47 Section: Characteristics of Waves 1. State the wave property or characteristic described in each of the following: a. measures the amount of particle vibration b. is the lowest point of a wave c. measures how long it takes for a complete wave oscillation to occur d. measures the rate of particle vibration e. is the highest point of a wave 2. Determine which part of the electromagnetic spectrum is described in each of the following. Refer to Table 1 in your textbook. a. have the greatest frequency b. have the greatest wavelength c. have the greatest period 3. Complete the following table. Indicate the changes that occur in the properties of a sound wave (frequency, pitch, wavelength, and wave speed) as a person experiences the Doppler effect. As a source of sound moves toward a person As a source of sound moves away from a person Increases Decreases Stays the same 4. Calculate the following for waves produced when you tap your finger in a pool of water twice each second. a. What is the frequency of the waves you are generating? What is the period of the waves? b. If the waves travel away from your finger with a speed of 1 m/s, what is their wavelength? Holt Science Spectrum 2 Waves

48 Section: Wave Interactions 1. Describe the behavior of the waves in the following situations, and give an example of each type of behavior. a. Waves strike a surface or boundary. b. Waves pass an edge or an opening. c. Waves pass from one medium to another. d. Waves pass through another wave. 2. Draw two waves that will interfere constructively and two waves that will interfere destructively, and draw the resulting wave produced in each case. Label each case constructive or destructive interference. 3. Determine the wavelength of the standing waves in the figure below. The string is 1.5 m long. Holt Science Spectrum 3 Waves

49 Section: Sound 1. Explain why the speed of sound changes if the temperature of the medium changes. 2. Explain what factors affect the loudness of a sound. 3. Describe how to change the pitch of a note played on a stringed instrument. 4. Determine which of the following has more harmonics in its sound a tuning fork or a guitar. Explain. 5. Describe how longitudinal waves in the air produce longitudinal waves in the cochlear fluid of the inner ear. 6. Determine the following distances based on the sonar data given. A ship sends a sound pulse downward and receives the reflected sound 2.50 s later. (Hint: Use the formula d vt. Assume the speed of sound in sea water is 1540 m/s.) a. the total distance traveled by the sound pulse b. the depth of the water Holt Science Spectrum 1 Sound and Light

50 Section: The Nature of Light 1. Explain what is meant by the dual nature of light. 2. Indicate whether the following behaviors of light can best be described in terms of the particle model or the wave model. a. Light can produce interference patterns. b. Light can travel in a vacuum. c. Dim blue light can knock electrons off a metal plate, whereas bright red light cannot. 3. Determine which band of the electromagnetic spectrum has each of the following: a. the longest wavelength b. the highest frequency c. the greatest energy d. the least energy 4. Explain whether the photons emitted by a bright light bulb are more energetic than those emitted by a dim light bulb of the same color. How does the color of the light bulbs determine the amount of energy of the electromagnetic waves? 5. List the regions of the electromagnetic spectrum in order of increasing energy. 6. Describe some uses of X rays and gamma rays in medicine. Holt Science Spectrum 2 Sound and Light

51 Section: Reflection and Color 1. Contrast the reflection of light from rough surfaces with that from smooth surfaces. Why do rough surfaces cause diffuse reflection? 2. Use the law of reflection to draw a sketch showing the incoming and reflected light rays when light shines on a mirror at an angle of 30 to the normal. Label the angle of incidence and the angle of reflection. 3. Describe the images produced by each of the following types of mirror: a. convex mirror b. concave mirror 4. Draw a diagram that shows how a plane mirror forms a virtual image. 5. Indicate what color a yellow cloth would appear to be if it were illuminated with a. sunlight. b. yellow light. c. blue light. Holt Science Spectrum 3 Sound and Light

52 Section: Refraction, Lenses, and Prisms 1. Indicate the direction that light is bent in each of the following situations. a. Light passes from air to water. b. Light passes from water to air. 2. Explain what causes a mirage. 3. Define total internal reflection, and give an example of its use in a practical device. 4. Name the type of lens that creates either virtual or real images, and state how light rays are bent by this type of lens. 5. Describe the function of each of the following parts of the eye. a. cornea b. pupil c. lens 6. Explain why prisms disperse white light. Holt Science Spectrum 4 Sound and Light

53 Section: Electric Charge and Force 1. Describe the interaction between two unlike charges. 2. Determine the amount by which the electric force between two charges is increased when the distance between the charges is halved. 3. Categorize the following as conductors or insulators: a. salt water b. a silver belt buckle c. a piece of wood d. a penny e. a candy bar 4. Determine whether each charge in the diagram below is positive or negative. Indicate which charge is greater. 5. Suppose the electric field in a region points upward. a. Determine the direction of the electric force on a proton placed in the field. b. Determine the direction of the electric force on an electron placed in the field. c. Compare the accelerations of the proton and electron placed in this electric field. Holt Science Spectrum 1 Electricity

54 Section: Current 1. State the condition that is necessary for a charge to move in a wire. 2. Explain how connecting an electric device to a battery produces a current in the device. 3. Relate the definition of electric current to the units of current. 4. Describe the cause of resistance and how the resistance of a wire can be determined. 5. Calculate the voltage required to produce a current of 2.0 A in a wire with a resistance of Calculate the amount of current in your fingers if they touch the terminals of a 12 V battery when the resistance of your skin is Compare superconductors and semiconductors with conductors and insulators. Holt Science Spectrum 2 Electricity

55 Section: Circuits 1. Identify the types of elements in the schematic diagram shown below. Give the number of each type of element in the diagram. 2. Predict which fuse would give the greatest protection against high current in a circuit a 20 A fuse or a 30 A fuse. Justify your answer. 3. Contrast series circuits and parallel circuits. 4. Calculate the power of a portable radio that operates on 24 V (two 12 V batteries in series) and draws 2.2 A of current. 5. Calculate the current drawn by a 4.0 W flashlight bulb that uses a 12 V battery. 6. Calculate the resistance of a 45 W light bulb that has a current of 0.38 A. 7. Explain why household appliances are almost always connected in parallel. Holt Science Spectrum 3 Electricity

56 Section: Magnets and Magnetic Fields 1. Draw and label the orientation of two bar magnets that would attract each other and two bar magnets that would repel each other. 2. Determine how many north poles and south poles there are when you break a permanent magnet in half and then break each half in half. 3. Draw the magnetic field for the permanent magnet shown below, and draw the direction a compass needle would point at each point indicated. S N 4. Compare the strength of the magnetic field near one pole of a bar magnet with the strength of the magnetic field farther away from the magnet. 5. Determine which direction you are facing if the needle of a compass you are holding points directly to your left. Explain. 6. Describe the movement of a compass needle that is free to rotate in any direction as you fly straight from the north magnetic pole to the south magnetic pole. Holt Science Spectrum 1 Magnetism

57 Section: Magnetism from Electric Currents 1. Determine the direction of current in the wire below that produced the magnetic field shown. Indicate the direction of current and the direction that electrons move through the wire. Magnetic field 2. Explain why some materials are magnetic and some are nonmagnetic. 3. Determine whether the magnetic field produced by a solenoid increases or decreases in each of the following cases: a. the number of coils is increased b. the current is decreased 4. Use the definition of magnetic domain to explain how an unmagnetized metal core is magnetized when it is inserted in a solenoid to make an electromagnet. 5. Explain why it is important that the current in the coil of a motor changes direction every time the coil makes a half revolution. Holt Science Spectrum 2 Magnetism

58 Section: Electric Currents from Magnetism 1. Describe the basic condition necessary to produce a current in a circuit without a voltage source, and list the three methods of meeting this condition. 2. Determine whether the current produced in a coil by electromagnetic induction would increase or decrease in each of the following cases: a. the number of loops in the coil is increased b. the strength of the magnet is decreased c. the loop is rotated so it is parallel to the field 3. Explain why the direction of the current produced by an AC generator alternates. 4. Describe electromagnetic waves and how they can travel through empty space. 5. Indicate whether the following transformers are step-up or step-down transformers: a. 50 turns in the primary coil; 40 turns in the secondary coil b. 40 turns in the primary coil; 50 turns in the secondary coil c. converts 120-V alternating current to 12-V alternating current Holt Science Spectrum 3 Magnetism

59 Section: Signals and Telecommunication 1. Applying Knowledge People who cannot hear use a finger alphabet to communicate. Examine the message below, then complete the following sentences. a. Each stands for a letter of the alphabet. b. You need to know the to decipher the message. 2. State two things from which communication signals are constructed, especially those used in sending long-distance messages. 3. Deduce the relationship between the quality of sound and the sampling rate for sound recording. For a CD, the sampling rate is , which means that during the sound recording the air pressure is measured times to represent the sound. The sampling rate of sound for telephone conversations is Based on your knowledge about the quality of the sound from a CD and from a telephone, deduce the relationship between the sampling rate and the quality of the sound. a. Sound quality is better when the sampling rate is lower. b. Sound quality is better when the sampling rate is higher. c. Sound quality is not affected by sampling rate. d. none of the above 4. Describe what happens when a person speaks into a microphone. 5. State the two values used in binary code, and name the corresponding states in terms of electric current. 6. List some objects in which sound is stored in digital format. Holt Science Spectrum 1 Communication Technology

60 Section: Telephone, Radio, and Television 1. Identify which of the following mediums or methods are used to transmit telephone signals. a. cables and wires that conduct electricity b. fiber-optic cables c. microwave transmission d. all of the above 2. Explain why three electron beams are enough to create a color image on a TV screen. Which three color phosphors are excited by the three electron beams? 3. Describe the fault in a broken telephone. The repair shop s diagnosis is that the membrane in the mouthpiece does not vibrate. Based on this information, what symptom or problem does the telephone exhibit? a. The voice from the speaker sounds broken. b. There is no sound in the earpiece of the receiver. c. The sound from your voice does not produce a changing current. d. all of the above 4. Predict what would happen if the tuner of a radio breaks. 5. Deduce a relationship between the quality of an image on a television screen and the number of scan lines that make an image on a TV screen. Recall that in the United States 525 scan lines are used for regular TV broadcast and 1250 scan lines are used for the new high-definition television (HDTV) broadcast. Holt Science Spectrum 2 Communication Technology

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